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Xie GY, Berk MR, Smith MD, DeMaria AN.Xie GY, et al.J Am Coll Cardiol. 1994 Oct;24(4):1041-5. doi: 10.1016/0735-1097(94)90867-2.J Am Coll Cardiol. 1994.PMID: 7930195Free article.Clinical Trial.